CP in multimedia services follows Mandelbrot–Zipf (M-Zipf) distribution [1]}, where the global probability of requesting content \(c_l\)  by all UEs, denoted by \(p_l\) , is given by
\(p_l=\dfrac{(l+\zeta )^{-\gamma }}{\sum \limits _{r=1}^{N_c}{(r+\zeta )^{-\gamma }}},\) 
